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Since ultrasonography is usually unable to distinguish a liposarcoma from a benign lipoma, MRI is the initial imaging of choice to provide evidence relative to making this distinction. [67] In myxoid liposarcoma, it shows low signal intensity mass with high signal intensity foci on T1-weighted MRI images.
A myxoid liposarcoma is a malignant adipose tissue neoplasm [1] of myxoid appearance histologically.. Myxoid liposarcomas are the second-most common type of liposarcoma, representing 30–40% of all liposarcomas in the limbs, occurring most commonly in the legs, particularly the thigh, followed by the buttocks, retroperitoneum, trunk, ankle, proximal limb girdle, head and neck, and wrist.
The cystic spaces in synovial sarcoma appear hyperintense on T2-weighted images, reflecting fluid content. Solid tumor components often demonstrate heterogeneous enhancement after contrast administration. The mass may display a multilocular appearance with well-defined cystic and solid regions, contributing to the grape-like pattern. [3] [4]
Liposarcoma is found in 1% of lipomas and is more likely to occur in lesions of the lower extremities, shoulders, and retroperitoneal areas. Other risk factors for liposarcoma include large size (>5 cm), associated with calcification , rapid growth, and/or invasion into nearby structures or through fascia into muscle tissue .
Date: 18 May 2021: Source: Own work: Author: Mikael Häggström, M.D. Author info - Reusing images - Conflicts of interest: None Mikael Häggström, M.D. Consent note: Consent from the patient or patient's relatives is regarded as redundant, because of absence of identifiable features (List of HIPAA identifiers) in the media and case information (See also HIPAA case reports guidance).
Familial multiple lipomatosis is usually diagnosed through a physical exam via palpation, medical history and imaging studies such as ultrasound, CT scan, or magnetic resonance imaging . A CT scan is an imaging method that uses x-rays to create images of cross sections of the body, while an MRI uses powerful magnets and radio waves to create ...
Histopathology of liposarcoma, H&E stain, with the main features: [5] - Spindle cells with enlarged, hyperchromatic nuclei. - Apparently univacuolated adipocytes (may look normal). - Lipoblasts (multivacuolated), but neither necessary nor sufficient for diagnosis of liposarcoma.
Of particular importance, the presence of pseudo-lipoblasts in a myxoid sarcoma-like background is an extremely strong indicator that the tumor is a MFS. [ 6 ] and tumors with a myxofibrosarcoma-like histopathology that initiate in the retroperitoneum, abdominal cavity, or pelvis are nearly always dedifferentiated liposarcomas .